BUFFALO, NY- October 16, 2023 – A new research paper was published on the cover of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science) Volume 15, Issue 19, entitled, “BMAL1 modulates senescence programming via AP-1.”

Cellular senescence and circadian dysregulation are biological hallmarks of aging. Whether they are coordinately regulated has not been thoroughly studied. In this new study, researchers Sarah K. Jachim, Jian Zhong, Tamas Ordog, Jeong-Heon Lee, Aditya V. Bhagwate, Nagaswaroop Kengunte Nagaraj, Jennifer J. Westendorf, João F. Passos, Aleksey V. Matveyenko, and Nathan K. LeBrasseur from the Mayo Clinic in Rochester, Minnesota, hypothesized that BMAL1, a pioneer transcription factor and master regulator of the molecular circadian clock, plays a role in the senescence program. 

“Here, we demonstrate BMAL1 is significantly upregulated in senescent cells and has altered rhythmicity compared to non-senescent cells.”

Through BMAL1-ChIP-seq, they showed that BMAL1 is uniquely localized to genomic motifs associated with AP-1 in senescent cells. Integration of BMAL1-ChIP-seq data with RNA-seq data revealed that BMAL1 presence at AP-1 motifs is associated with active transcription. Finally, the researchers showed that BMAL1 contributes to AP-1 transcriptional control of key features of the senescence program, including altered regulation of cell survival pathways, and confers resistance to drug-induced apoptosis. 

“Overall, these results highlight a previously unappreciated role of the core circadian clock component BMAL1 on the molecular phenotype of senescent cells.”

DOI - https://doi.org/10.18632/aging.205112

Corresponding authors - Nathan K. LeBrasseur - lebrasseur.nathan@mayo.edu

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Keywords - aging, AP-1, circadian clock, cellular senescence, senolytic, transcription regulation

About Aging-US

Launched in 2009, Aging-US publishes papers of general interest and biological significance in all fields of aging research and age-related diseases, including cancer—and now, with a special focus on COVID-19 vulnerability as an age-dependent syndrome. Topics in Aging-US go beyond traditional gerontology, including, but not limited to, cellular and molecular biology, human age-related diseases, pathology in model organisms, signal transduction pathways (e.g., p53, sirtuins, and PI-3K/AKT/mTOR, among others), and approaches to modulating these signaling pathways.

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Aging (Aging-US)

Senescence Program Modulated by BMAL1 via AP-1

BUFFALO, NY- October 23, 2023 – A new research paper was published in Oncotarget's Volume 14 on October 19, 2023, entitled, “Apoptotic cells may drive cell death in hair follicles during their regression cycle.”

Intravital microscopy in live mice has shown that the elimination of epithelial cells during hair follicle regression involves supra-basal cell differentiation and basal cell apoptosis through synergistic action of TGF-β (transforming growth factor) and mesenchymal-epithelial interactions. In this process the basal epithelial cells are not internally committed to death and the mesenchymal dermal papilla (DP) plays an essential role in death induction. Given that DP cells are not necessary for completion of the cycle, only for its initiation, it is still an open question as to the mechanism that leads to the propagation of apoptosis towards the regenerative stem cell population.

In their new study, researchers Bradley D. Keister, Kailin R. Mesa and Krastan B. Blagoev from the National Science Foundation, The Jane Coffin Childs Memorial Fund for Medical Research, Yale School of Medicine, Johns Hopkins University, Bulgarian Academy of Sciences, and Sorbonne Université performed a quantitative analysis of the length of hair follicles to investigate their regression cycle. 

“In this paper we introduced a mathematical model of the hair follicle regression cycle that postulates that the regression is initiated by the dermal papilla, but that this signal affects only the cells adjacent to it.”

The data are consistent with a propagation mechanism driven by apoptotic cells inducing apoptosis in their neighboring cells. The observation that the apoptosis slows down as the apoptotic front approaches the stem cells at the end of the follicle is consistent with a gradient of a pro-survival signal sent by these stem cells. An experiment that can falsify this mechanism is proposed.

“In conclusion, hair follicle regression may be governed by cell-cell induced programmed cell death, which slows down as the stem cell compartment is approached and does not affect the stem cell compartment from which the growth phase is initiated. The class of models introduced here can be used to describe the renewal kinetics of other stem cell niches like the intestinal stem cell niche [18].”

DOI - https://doi.org/10.18632/oncotarget.28529

Correspondence to - Krastan B. Blagoev - kblagoev@nsf.gov
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Keywords - cancer, hair follicle, stem cells, regression cycle, mathematical model, analysis

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Oncotarget (a primarily oncology-focused, peer-reviewed, open access journal) aims to maximize research impact through insightful peer-review; eliminate borders between specialties by linking different fields of oncology, cancer research and biomedical sciences; and foster application of basic and clinical science.

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Apoptotic Cells May Drive Cell Death in Hair Follicles During Regression Cycle

BUFFALO, NY- October 30, 2023 – A new editorial paper was published in Oncotarget's Volume 14 on March 24, 2023, entitled, “Neutrophil PAD4: how does it function in cancer beyond promoting NETosis?”

Expansion of pathologically activated immune suppressive myeloid cells called myeloid-derived suppressor cells (MDSC) is one of the hallmarks of cancer. In most tumor types, MDSC are represented primarily by pathologically activated neutrophils (PMN-MDSC). In this new editorial, researchers Laura Garcia-Gerique and Yulia Nefedova from the Wistar Institute discussed their team’s recent study identifying a novel mechanism by which neutrophil PAD4 promotes cancer progression. 

“Using several transplantable and genetically engineered mouse models, we demonstrated that tumor growth was accompanied by significantly elevated enzymatic activity of neutrophil PAD4 [10]. To further clarify the role of PAD4 in tumor progression, we utilized PAD4fl/fl MRP8Cre mice with targeted deletion of PAD4 in myeloid cells, primarily neutrophils.”

PMN-MDSC originate in the bone marrow and migrate to various sites including tumor tissues and premetastatic niches. These cells have a relatively short lifespan (less than 48 hours) and, therefore, are continually replaced from the bone marrow. Tumor-infiltrating PMN-MDSC possess a potent suppressive activity as they are able to inhibit both antigen-specific immune responses of T cells and non-specific anti-CD3/CD28-stimulated responses. As a result, a highly immunosuppressive environment is created in tumors, which prevents their rejection via immunological mechanisms. 

In addition, PMN-MDSC employ non-immunological mechanisms to facilitate tumor progression, including angiogenesis, remodeling of extracellular matrix, and production of cytokines. In patients with solid tumors, levels of MDSC in circulation and tumor tissues have been positively associated with a poor response to the therapy in many types of cancer and represent an independent indicator of poor outcomes. However, many of the details about how PMN-MDSC support cancer progression, and thus approaches for therapeutically targeting these cells, remain enigmatic.

“Taken together, our study identified a new mechanism responsible for transcriptional regulation of neutrophil migration and a new mechanism by which neutrophil PAD4 is contributing to tumor progression. PAD4 inhibitors are in development and may enter early phase clinical trials in the future.”

DOI - https://doi.org/10.18632/oncotarget.28369

Correspondence to - Yulia Nefedova - ynefedova@wistar.org

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Keywords - cancer, PAD4, PMN-MDSC, neutrophils, neutrophil migration

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Oncotarget (a primarily oncology-focused, peer-reviewed, open access journal) aims to maximize research impact through insightful peer-review; eliminate borders between specialties by linking different fields of oncology, cancer research and biomedical sciences; and foster application of basic and clinical science.

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Neutrophil PAD4 in Cancer, Beyond Promoting NETosis

Hair follicles are dynamic structures that undergo cyclic phases of growth, regression and quiescence. The growth phase, known as anagen, lasts for several years, followed by a short regression phase called catagen. During catagen, most cells within the follicle undergo programmed cell death, but a small population of stem cells remains viable to replenish the follicle during the subsequent growth phase. Understanding the mechanisms involved in hair follicle regression is not only important for elucidating normal tissue homeostasis but also for studying pathological conditions such as cancer and aging.

In a recent study, researchers Bradley D. Keister, Kailin R. Mesa and Krastan B. Blagoev from the National Science Foundation, The Jane Coffin Childs Memorial Fund for Medical Research, Yale School of Medicine, Johns Hopkins University, Bulgarian Academy of Sciences, and Sorbonne Université shed light on the role of apoptotic cells in hair follicle regression and cell death. Their research paper was published in Oncotarget on October 19, 2023, entitled, “Apoptotic cells may drive cell death in hair follicles during their regression cycle.”

“Here, we use a quantitative analysis of the length of hair follicles during their regression cycle.”

Full blog - https://www.oncotarget.org/2023/11/29/can-mechanisms-of-hair-loss-shed-light-on-cancer-and-aging/

Paper DOI - https://doi.org/10.18632/oncotarget.28529

Correspondence to - Krastan B. Blagoev - kblagoev@nsf.gov

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Keywords - cancer, hair follicle, stem cells, regression cycle, mathematical model, analysis

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Oncotarget (a primarily oncology-focused, peer-reviewed, open access journal) aims to maximize research impact through insightful peer-review; eliminate borders between specialties by linking different fields of oncology, cancer research and biomedical sciences; and foster application of basic and clinical science.

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Can Mechanisms of Hair Loss Shed Light on Cancer and Aging?

BUFFALO, NY- April 30, 2024 – A new #researchpaper was #published on the #cover of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science) Volume 16, Issue 8, entitled, “Senescent characteristics of human corneal endothelial cells upon ultraviolet-A exposure.”

In this new study, researchers Kohsaku Numa, Sandip Kumar Patel, Zhixin A. Zhang, Jordan B. Burton, Akifumi Matsumoto, Jun-Wei B. Hughes, Chie Sotozono, Birgit Schilling, Pierre-Yves Desprez, Judith Campisi (1948-2024), and Koji Kitazawa from Buck Institute for Research on Aging, Kyoto Prefectural University of Medicine, University of Cambridge, and California Pacific Medical Center investigated the senescent phenotypes of human corneal endothelial cells (hCEnCs) upon treatment with ultraviolet (UV)-A.

“We assessed cell morphology, senescence-associated β-galactosidase (SA-β-gal) activity, cell proliferation and expression of senescence markers (p16 and p21) in hCEnCs exposed to UV-A radiation, and senescent hCEnCs induced by ionizing radiation (IR) were used as positive controls.”

The researchers performed RNA sequencing and proteomics analyses to compare gene and protein expression profiles between UV-A- and IR-induced senescent hCEnCs — they also compared the results to non-senescent hCEnCs. Cells exposed to 5 J/cm2 of UV-A or to IR exhibited typical senescent phenotypes, including enlargement, increased SA-β-gal activity, decreased cell proliferation and elevated expression of p16 and p21. RNA-Seq analysis revealed that 83.9% of the genes significantly upregulated and 82.6% of the genes significantly downregulated in UV-A-induced senescent hCEnCs overlapped with the genes regulated in IR-induced senescent hCEnCs. Proteomics also revealed that 93.8% of the proteins significantly upregulated in UV-A-induced senescent hCEnCs overlapped with those induced by IR. In proteomics analyses, senescent hCEnCs induced by UV-A exhibited elevated expression levels of several factors part of the senescence-associated secretory phenotype.

“In this study, where senescence was induced by UV-A, a more physiological stress for hCEnCs compared to IR, we determined that UV-A modulated the expression of many genes and proteins typically altered upon IR treatment, a more conventional method of senescence induction, even though UV-A also modulated specific pathways unrelated to IR.”

DOI - https://doi.org/10.18632/aging.205761

Corresponding author - Koji Kitazawa - kkitazaw@koto.kpu-m.ac.jp

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About Aging-US

Aging publishes research papers in all fields of aging research including but not limited, aging from yeast to mammals, cellular senescence, age-related diseases such as cancer and Alzheimer’s diseases and their prevention and treatment, anti-aging strategies and drug development and especially the role of signal transduction pathways such as mTOR in aging and potential approaches to modulate these signaling pathways to extend lifespan. The journal aims to promote treatment of age-related diseases by slowing down aging, validation of anti-aging drugs by treating age-related diseases, prevention of cancer by inhibiting aging. Cancer and COVID-19 are age-related diseases.

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Cover Paper: Senescent Characteristics of Human Corneal Endothelial Cells Upon UV-A Exposure

With an ever-increasing global population grappling with age-related ocular ailments like cataracts, dry eyes, glaucoma, and macular degeneration, the need for new research in this domain is more pressing than ever. 

In a new study, researchers Kohsaku Numa, Sandip Kumar Patel, Zhixin A. Zhang, Jordan B. Burton, Akifumi Matsumoto, Jun-Wei B. Hughes, Chie Sotozono, Birgit Schilling, Pierre-Yves Desprez, Judith Campisi (1948-2024), and Koji Kitazawa from the Buck Institute for Research on Aging, Kyoto Prefectural University of Medicine, University of Cambridge, and California Pacific Medical Center shed light on a pivotal aspect of corneal health – the impact of ultraviolet-A (UV-A) radiation on corneal endothelial cells. Their research paper was published on the cover of Aging’s Volume 16, Issue 8, entitled, “Senescent characteristics of human corneal endothelial cells upon ultraviolet-A exposure.”

“The objective of this study was to investigate the senescent phenotypes of human corneal endothelial cells (hCEnCs) upon treatment with ultraviolet (UV)-A.”

Full blog - https://aging-us.org/2024/05/uv-a-exposure-cellular-senescence-and-vision-impairment/

Paper DOI - https://doi.org/10.18632/aging.205761

Corresponding author - Koji Kitazawa - kkitazaw@koto.kpu-m.ac.jp

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Keywords - aging, cellular senescence, senescence-associated secretory phenotype, RNA-Seq, proteomics, gene ontology analysis

About Aging-US

Aging publishes research papers in all fields of aging research including but not limited, aging from yeast to mammals, cellular senescence, age-related diseases such as cancer and Alzheimer’s diseases and their prevention and treatment, anti-aging strategies and drug development and especially the role of signal transduction pathways such as mTOR in aging and potential approaches to modulate these signaling pathways to extend lifespan. The journal aims to promote treatment of age-related diseases by slowing down aging, validation of anti-aging drugs by treating age-related diseases, prevention of cancer by inhibiting aging. Cancer and COVID-19 are age-related diseases.

Aging is indexed by PubMed/Medline (abbreviated as “Aging (Albany NY)”), PubMed Central, Web of Science: Science Citation Index Expanded (abbreviated as “Aging‐US” and listed in the Cell Biology and Geriatrics & Gerontology categories), Scopus (abbreviated as “Aging” and listed in the Cell Biology and Aging categories), Biological Abstracts, BIOSIS Previews, EMBASE, META (Chan Zuckerberg Initiative) (2018-2022), and Dimensions (Digital Science).

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UV-A Exposure, Cellular Senescence, and Vision Impairment

BUFFALO, NY- August 16, 2024 – A new #review was #published as the #cover paper of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science), Volume 16, Issue 15, entitled, “Types of cell death and their relations to host immunological pathways”.

Various immune pathways in the host, such as TH1, TH2, TH3, TH9, TH17, TH22, TH1-like, and THαβ, have been identified. While TH2 and TH9 responses primarily target multicellular parasites, host immune pathways against viruses, intracellular microorganisms (like bacteria, protozoa, and fungi), and extracellular microorganisms utilize programmed cell death mechanisms to initiate immune responses and effectively eliminate pathogens.

In their review, researchers Kuo-Cheng Lu, Kuo-Wang Tsai, Yu-Kuen Wang, and Wan-Chung Hu from Taipei Tzu Chi Hospital, Fu Jen Catholic University, Taoyuan Armed Forces General Hospital, Tri-Service General Hospital and Ming Chuan University, reviewed these cell death pathways associated with the host immunological pathways.

"These relationships can help us understand the host defense mechanisms against invading pathogens and provide new insights for developing better therapeutic strategies against infections or autoimmune disorders.”

DOI - https://doi.org/10.18632/aging.206035

Corresponding authors - Wan-Chung Hu - Wanchung.Hu09@tzuchi.com.tw

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Keywords - aging, apoptosis, autophagy, ferroptosis, necroptosis, NETosis, pyroptosis

About Aging-US

The mission of the journal is to understand the mechanisms surrounding aging and age-related diseases, including cancer as the main cause of death in the modern aged population.

The journal aims to promote 1) treatment of age-related diseases by slowing down aging, 2) validation of anti-aging drugs by treating age-related diseases, and 3) prevention of cancer by inhibiting aging. (Cancer and COVID-19 are age-related diseases.)

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Cell Death Types and Their Relations to Host Immune Pathways

In this #review, #researchers explore the intricate relationship between various cell death pathways and host immunological responses.

Kuo-Cheng Lu, Kuo-Wang Tsai, Yu-Kuen Wang, and Wan-Chung Hu
from Taipei Tzu Chi Hospital, Fu Jen Catholic University, Taoyuan Armed Forces General Hospital, Tri-Service General Hospital and Ming Chuan University, have delved into the literature surrounding cell death pathways and their connections to host immunological pathways. 

Their review was published as the cover paper of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science), Volume 16, Issue 15, entitled, “Types of Cell Death and Their Relations to Host Immunological Pathways.”

Full blog - https://aging-us.org/2024/08/exploring-links-between-cell-death-pathways-and-immune-responses/

Paper DOI - https://doi.org/10.18632/aging.206035

Corresponding author - Wan-Chung Hu - Wanchung.Hu09@tzuchi.com.tw

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Keywords - aging, apoptosis, autophagy, ferroptosis, necroptosis, NETosis, pyroptosis

About Aging-US

The mission of the journal is to understand the mechanisms surrounding aging and age-related diseases, including cancer as the main cause of death in the modern aged population.

The journal aims to promote 1) treatment of age-related diseases by slowing down aging, 2) validation of anti-aging drugs by treating age-related diseases, and 3) prevention of cancer by inhibiting aging. (Cancer and COVID-19 are age-related diseases.)

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Exploring Links Between Cell Death Pathways and Immune Responses

Oncotarget is a primarily oncology-focused, peer-reviewed, open access journal. Papers are published continuously within yearly volumes in their final and complete form and then quickly released to Pubmed.

Oncotarget is now indexed by MEDLINE, PubMed and PMC/PubMed.

Read about the Oncotarget Scientific Integrity Process: https://www.oncotarget.com/scientific_integrity/

Aging-US is dedicated to advancing our understanding of the biological mechanisms that drive aging and the development of age-related diseases. Our mission is to serve as a platform for high-quality research that uncovers the cellular, molecular, and systemic processes underlying aging, and translates these insights into strategies to extend healthspan and delay the onset of chronic disease.

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New tracks tagged #cellscience